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Title |
A Numerical Model to Evaluate Fire-Resistant Capacity of the Reinforced Concrete Members
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Authors |
황진욱 ; 하상희 ; 이용훈 ; 김화중 ; 곽효경 |
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DOI |
https://doi.org/10.4334/JKCI.2013.25.5.497 |
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Keywords |
화재손상된 콘크리트 ; 콘크리트의 내화성능 ; 비정상상태 변형률 ; 콘크리트의 고온크리프 ; 콘크리트의 열전달 fire-exposed concrete ; fire resistant capacity of concrete ; transient strain of concrete ; concrete at elevated temperature ; heat transfer of concrete |
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Abstract |
This paper introduces a numerical model which can evaluate the fire-resistant capacity of reinforced concrete members. On the basis of the transient heat transfer considering the heat conduction, convection and radiation, time-dependent temperature distribution across a section is determined. A layered fiber section method is adopted to consider non-linear material properties depending on the temperature and varying with the position of a fiber. Furthermore, effects of non-mechanical strains of each fiber like thermal expansion, transient strain and creep strain are reflected on the non-linear structural analysis to take into account the extreme temperature variation induced by the fire. Analysis results by the numerical model are compared with experimental data from the standard fire tests to validate an exactness of the introduced numerical model. Also, time-dependent changes in the resisting capacities of reinforced concrete members exposed to fire are investigated through the analyses and, the resisting capacities evaluated are compared with those determined by the design code.
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